diff --git a/homework2/.eide/eide.json b/homework2/.eide/eide.json
index 9a92c61..379a9e5 100644
--- a/homework2/.eide/eide.json
+++ b/homework2/.eide/eide.json
@@ -2,7 +2,9 @@
   "name": "homework2",
   "type": "C51",
   "dependenceList": [],
-  "srcDirs": [],
+  "srcDirs": [
+    "src"
+  ],
   "virtualFolder": {
     "name": "<virtual_root>",
     "files": [],
@@ -17,7 +19,7 @@
   "targets": {
     "Debug": {
       "excludeList": [],
-      "toolchain": "SDCC",
+      "toolchain": "Keil_C51",
       "compileConfig": {
         "options": "null"
       },
@@ -52,6 +54,24 @@
             "$mainFileName": "main",
             "output-format": "hex"
           }
+        },
+        "Keil_C51": {
+          "version": 2,
+          "beforeBuildTasks": [],
+          "afterBuildTasks": [],
+          "global": {
+            "ram-mode": "SMALL",
+            "rom-mode": "LARGE"
+          },
+          "c/cpp-compiler": {
+            "optimization-type": "SPEED",
+            "optimization-level": "level-8"
+          },
+          "asm-compiler": {},
+          "linker": {
+            "remove-unused": true,
+            "output-format": "elf"
+          }
         }
       }
     }
diff --git a/homework2/homework2.pdsprj b/homework2/homework2.pdsprj
index 261f017..8cadaba 100644
Binary files a/homework2/homework2.pdsprj and b/homework2/homework2.pdsprj differ
diff --git a/homework2/src/homework2.h b/homework2/src/homework2.h
new file mode 100644
index 0000000..6a9eebc
--- /dev/null
+++ b/homework2/src/homework2.h
@@ -0,0 +1,19 @@
+#include <reg52.h>
+
+sbit D1 = P2 ^ 7;
+sbit D2 = P2 ^ 6;
+sbit D3 = P2 ^ 5;
+sbit D4 = P2 ^ 4;
+sbit D5 = P2 ^ 3;
+sbit D6 = P2 ^ 2;
+sbit D7 = P2 ^ 1;
+sbit D8 = P2 ^ 0;
+sbit ADDR0 = P1 ^ 0;
+sbit ADDR1 = P1 ^ 1;
+sbit ADDR2 = P1 ^ 2;
+sbit ADDR3 = P1 ^ 3;
+sbit ENLED = P1 ^ 4;
+
+void Delay(unsigned int t){
+	while(t--);
+}
\ No newline at end of file
diff --git a/homework2/src/test1.c b/homework2/src/test1.c
new file mode 100644
index 0000000..d695d5b
--- /dev/null
+++ b/homework2/src/test1.c
@@ -0,0 +1,15 @@
+// 点亮一个小灯泡
+#include <reg52.h>
+#include "homework2.h"
+
+int main()
+{
+    ENLED = 0;
+    ADDR3 = 1;
+    ADDR2 = 1;
+    ADDR1 = 1;
+    ADDR0 = 0;
+    D1    = 0;
+    while (1) {
+    }
+}
\ No newline at end of file